Locating the Source of Long-Distance Radio Distress Signals from the Southern Ocean
This report summarizes a feasibility study and strategy appropriate to search and rescue operations for ships or aircraft in distress in the Southern Ocean. The use of high frequency ionospherically-propagated radio transmissions is justified. Measurement of the direction of arrival of a radio signa...
Main Author: | |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1988
|
Subjects: | |
Online Access: | http://www.dtic.mil/docs/citations/ADA198239 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA198239 |
Summary: | This report summarizes a feasibility study and strategy appropriate to search and rescue operations for ships or aircraft in distress in the Southern Ocean. The use of high frequency ionospherically-propagated radio transmissions is justified. Measurement of the direction of arrival of a radio signal facilitates ray-tracing through the ionosphere Characteristics of the F2 region mid-latitude ionization trough are considered in detail. Because the trough is displaced towards Australia, its position must be known as near as practicable in real time for sufficiently accurate ray-tracing to be performed quickly enough after receipt of a distress signal. The differential Doppler technique using e.g. 150 and 400 MHz transmissions from NAVSAT (NNSS) satellites is recommended in locating the trough position. |
---|